Phys. Rev. D 92, 112002 (2015)
LHCb:
INSPIRE
Parameter
Measurement
\({\cal{B}} ( \bar{B}^{0} \to J/\psi \gamma )\)
\(1.5 \times 10^{-6}\)
\({\cal{B}} ( \bar{B}^{0}_s \to J/\psi \gamma )\)
\(7.3 \times 10^{-6}\)